What about removing duos from solo queue and incentivizing them to play flex? 2/3/5 stack premades in flex and pure solo in solo queue. It would make matchmaking better and also give people a reason to play flex/take it serious. The game has enough people who want to play ranked but refuse to play solo that they would start playing flex. Throw in some better rewards too just to top it off.
It is something we talk about frequently. I really like the direction of it, but there are some queue health concerns that have held us back in the past.
It's worth reopening the discussion again though.